Release 4.11 net/ipv4/netfilter/ipt_rpfilter.c
/*
* Copyright (c) 2011 Florian Westphal <fw@strlen.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* based on fib_frontend.c; Author: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ip.h>
#include <net/ip.h>
#include <net/ip_fib.h>
#include <net/route.h>
#include <linux/netfilter/xt_rpfilter.h>
#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
MODULE_DESCRIPTION("iptables: ipv4 reverse path filter match");
/* don't try to find route from mcast/bcast/zeronet */
static __be32 rpfilter_get_saddr(__be32 addr)
{
if (ipv4_is_multicast(addr) || ipv4_is_lbcast(addr) ||
ipv4_is_zeronet(addr))
return 0;
return addr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static bool rpfilter_lookup_reverse(struct net *net, struct flowi4 *fl4,
const struct net_device *dev, u8 flags)
{
struct fib_result res;
bool dev_match;
int ret __maybe_unused;
if (fib_lookup(net, fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE))
return false;
if (res.type != RTN_UNICAST) {
if (res.type != RTN_LOCAL || !(flags & XT_RPFILTER_ACCEPT_LOCAL))
return false;
}
dev_match = false;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
for (ret = 0; ret < res.fi->fib_nhs; ret++) {
struct fib_nh *nh = &res.fi->fib_nh[ret];
if (nh->nh_dev == dev) {
dev_match = true;
break;
}
}
#else
if (FIB_RES_DEV(res) == dev)
dev_match = true;
#endif
return dev_match || flags & XT_RPFILTER_LOOSE;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 153 | 95.03% | 1 | 25.00% |
| Eric W. Biedermann | 5 | 3.11% | 1 | 25.00% |
| Andy Gospodarek | 2 | 1.24% | 1 | 25.00% |
| Xin Long | 1 | 0.62% | 1 | 25.00% |
| Total | 161 | 100.00% | 4 | 100.00% |
static bool
rpfilter_is_loopback(const struct sk_buff *skb, const struct net_device *in)
{
return skb->pkt_type == PACKET_LOOPBACK || in->flags & IFF_LOOPBACK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 16 | 51.61% | 1 | 50.00% |
| Liping Zhang | 15 | 48.39% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_rpfilter_info *info;
const struct iphdr *iph;
struct flowi4 flow;
bool invert;
info = par->matchinfo;
invert = info->flags & XT_RPFILTER_INVERT;
if (rpfilter_is_loopback(skb, xt_in(par)))
return true ^ invert;
iph = ip_hdr(skb);
if (ipv4_is_zeronet(iph->saddr)) {
if (ipv4_is_lbcast(iph->daddr) ||
ipv4_is_local_multicast(iph->daddr))
return true ^ invert;
}
flow.flowi4_iif = LOOPBACK_IFINDEX;
flow.daddr = iph->saddr;
flow.saddr = rpfilter_get_saddr(iph->daddr);
flow.flowi4_oif = 0;
flow.flowi4_mark = info->flags & XT_RPFILTER_VALID_MARK ? skb->mark : 0;
flow.flowi4_tos = RT_TOS(iph->tos);
flow.flowi4_scope = RT_SCOPE_UNIVERSE;
return rpfilter_lookup_reverse(xt_net(par), &flow, xt_in(par), info->flags) ^ invert;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 170 | 88.08% | 2 | 28.57% |
| Liping Zhang | 14 | 7.25% | 2 | 28.57% |
| Pablo Neira Ayuso | 6 | 3.11% | 1 | 14.29% |
| Eric W. Biedermann | 2 | 1.04% | 1 | 14.29% |
| Pavel Emelyanov | 1 | 0.52% | 1 | 14.29% |
| Total | 193 | 100.00% | 7 | 100.00% |
static int rpfilter_check(const struct xt_mtchk_param *par)
{
const struct xt_rpfilter_info *info = par->matchinfo;
unsigned int options = ~XT_RPFILTER_OPTION_MASK;
if (info->flags & options) {
pr_info("unknown options encountered");
return -EINVAL;
}
if (strcmp(par->table, "mangle") != 0 &&
strcmp(par->table, "raw") != 0) {
pr_info("match only valid in the \'raw\' "
"or \'mangle\' tables, not \'%s\'.\n", par->table);
return -EINVAL;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 91 | 100.00% | 1 | 100.00% |
| Total | 91 | 100.00% | 1 | 100.00% |
static struct xt_match rpfilter_mt_reg __read_mostly = {
.name = "rpfilter",
.family = NFPROTO_IPV4,
.checkentry = rpfilter_check,
.match = rpfilter_mt,
.matchsize = sizeof(struct xt_rpfilter_info),
.hooks = (1 << NF_INET_PRE_ROUTING),
.me = THIS_MODULE
};
static int __init rpfilter_mt_init(void)
{
return xt_register_match(&rpfilter_mt_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 16 | 100.00% | 1 | 100.00% |
| Total | 16 | 100.00% | 1 | 100.00% |
static void __exit rpfilter_mt_exit(void)
{
xt_unregister_match(&rpfilter_mt_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
module_init(rpfilter_mt_init);
module_exit(rpfilter_mt_exit);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 605 | 92.93% | 2 | 22.22% |
| Liping Zhang | 29 | 4.45% | 2 | 22.22% |
| Eric W. Biedermann | 7 | 1.08% | 1 | 11.11% |
| Pablo Neira Ayuso | 6 | 0.92% | 1 | 11.11% |
| Andy Gospodarek | 2 | 0.31% | 1 | 11.11% |
| Pavel Emelyanov | 1 | 0.15% | 1 | 11.11% |
| Xin Long | 1 | 0.15% | 1 | 11.11% |
| Total | 651 | 100.00% | 9 | 100.00% |
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